The human respiratory system (B5)

Ventilation;

Inspiration Expiration

Intercostal muscles + ribs Contracts/tightens Relaxes

Diaphragm Contract Relaxes

Lung volume Big volume Smaller volume

Pressure Small pressure Big pressure

Movement of air Air flows into body Air flows out of body

The alveoli is where the gas exchange takes place. It puts oxygen in the blood. It does this by diffusion. When you breathe in oxygen it is diffused into your blood. Oxygen diffuses from the…